Breek Arms 3FO-S Flash Hider | 9mm | 5/8x24

Breek Arms 3FO-S Flash Hider | 9mm | 5/8×24

The Breek Arms 3FO-S Flash Hider | 9mm | 5/8×24 is a compact, high-efficiency muzzle device designed to suppress flash on 9mm AR platforms using the less common 5/8×24 thread pitch. This short variant of the original 3FO offers exceptional flash mitigation in a minimal footprint, making it ideal for compact builds, short barrels, and suppressor-ready configurations.

Built from heat-treated 4140 steel and finished in a black nitride coating, the 3FO-S is both durable and corrosion-resistant. Its three-prong open design disperses unburnt powder and muzzle flash away from the shooter’s line of sight, significantly improving visibility in low-light environments. Whether you’re operating indoors or outdoors, the 3FO-S helps reduce the visual disruption that occurs during rapid fire or nighttime shooting.

This version is specifically threaded in 5/8×24, which makes it compatible with 9mm barrels using this thread pitch—a setup often found in custom or hybrid builds. Despite its short length, the 3FO-S maintains excellent bore alignment and is safe for use with suppressor mounts or blast diverters where concentricity is crucial.

The reduced overall length makes the 3FO-S ideal for users who want to maintain a shorter muzzle profile without sacrificing performance. Its prongs are tuned to avoid the audible ringing effect associated with many open-style flash hiders while still delivering solid flash suppression. The slim diameter and minimalist design also make it compatible with handguards that have limited clearance at the muzzle.

For builders looking to combine flash suppression with compact form and suppressor compatibility, the Breek Arms 3FO-S Flash Hider is a smart and rugged solution. It’s engineered for 9mm systems where performance and footprint must be perfectly balanced.